EP3514331B1 - Gekühltes schaufelblatt und zugehöriges gasturbinentriebwerk - Google Patents

Gekühltes schaufelblatt und zugehöriges gasturbinentriebwerk Download PDF

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Publication number
EP3514331B1
EP3514331B1 EP19152897.5A EP19152897A EP3514331B1 EP 3514331 B1 EP3514331 B1 EP 3514331B1 EP 19152897 A EP19152897 A EP 19152897A EP 3514331 B1 EP3514331 B1 EP 3514331B1
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EP
European Patent Office
Prior art keywords
platform
cavity
airfoil
skin core
hybrid skin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19152897.5A
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English (en)
French (fr)
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EP3514331A1 (de
Inventor
Nicholas M. LORICCO
Ricardo Trindade
Dominic J. Mongillo
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RTX Corp
Original Assignee
Raytheon Technologies Corp
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Publication of EP3514331A1 publication Critical patent/EP3514331A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
    • F01D5/187—Convection cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/06—Fluid supply conduits to nozzles or the like
    • F01D9/065—Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/32—Application in turbines in gas turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/12—Fluid guiding means, e.g. vanes
    • F05D2240/124—Fluid guiding means, e.g. vanes related to the suction side of a stator vane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/80—Platforms for stationary or moving blades
    • F05D2240/81—Cooled platforms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/201—Heat transfer, e.g. cooling by impingement of a fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/221—Improvement of heat transfer
    • F05D2260/2212—Improvement of heat transfer by creating turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/221—Improvement of heat transfer
    • F05D2260/2214—Improvement of heat transfer by increasing the heat transfer surface
    • F05D2260/22141—Improvement of heat transfer by increasing the heat transfer surface using fins or ribs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

  • Illustrative embodiments pertain to the art of turbomachinery, and specifically to turbine rotor components.
  • Gas turbine engines are rotary-type combustion turbine engines built around a power core made up of a compressor, combustor and turbine, arranged in flow series with an upstream inlet and downstream exhaust.
  • the compressor compresses air from the inlet, which is mixed with fuel in the combustor and ignited to generate hot combustion gas.
  • the turbine extracts energy from the expanding combustion gas, and drives the compressor via a common shaft. Energy is delivered in the form of rotational energy in the shaft, reactive thrust from the exhaust, or both.
  • each spool is subdivided into a number of stages, which are formed of alternating rows of rotor blade and stator vane airfoils.
  • the airfoils are shaped to turn, accelerate and compress the working fluid flow, or to generate lift for conversion to rotational energy in the turbine.
  • Airfoils may incorporate various cooling cavities located adjacent external side walls. Such cooling cavities are subject to both hot material walls (exterior or external) and cold material walls (interior or internal). Although such cavities are designed for cooling portions of airfoil bodies, local internal cooling flow characteristics may result in localized hot spot metal regions where the incorporation of various convective and film cooling design concepts may be limiting and/or non-optimal due to restrictions associated with conventional core tooling and casting manufacturing processes that prohibit more robust and optimal cooling configurations to be integrated into current state-of-the-art cooling concepts. In order to mitigate the inherent variability associated with conventional vane baffle impingement-film cooling design concepts it becomes desirable to design cooling concepts that enable more robust approaches to tailoring and optimizing thermal cooling requirements based on the local distribution of external heatload. Accordingly, improved means for providing cooling within an airfoil may be desirable.
  • EP 3056680 A1 discloses an airfoil disposed between an outer diameter platform and an inner diameter platform, defining a cross-passage within the airfoil through which a leakage flow can pass through and into a leakage path.
  • an airfoil for a gas turbine engine is provided as described in claim 1.
  • airfoils may include at least one thermal transfer augmentation feature within the first hybrid skin core cooling cavity passage.
  • the airfoils may include that the first cavity width is larger at the first platform feed cavity and smaller at the second platform exit cavity such that the first hybrid skin core cooling cavity passage tapers in a direction from the first platform feed cavity to the second platform exit cavity.
  • the airfoils may include that the first platform feed cavity is defined in part by a cover plate installed to the first platform.
  • the airfoils may include that the second platform exit cavity is defined in part by a cover plate installed to the second platform.
  • a gas turbine engine is provided as described in claim 6.
  • FIG. 1 schematically illustrates a gas turbine engine 20.
  • the gas turbine engine 20 is disclosed herein as a two-spool turbofan that generally incorporates a fan section 22, a compressor section 24, a combustor section 26 and a turbine section 28.
  • Alternative engines might include an augmentor section (not shown) among other systems or features.
  • the fan section 22 drives air along a bypass flow path B in a bypass duct, while the compressor section 24 drives air along a core flow path C for compression and communication into the combustor section 26 then expansion through the turbine section 28.
  • the exemplary engine 20 generally includes a low speed spool 30 and a high speed spool 32 mounted for rotation about an engine central longitudinal axis A relative to an engine static structure 36 via several bearing systems 38. It should be understood that various bearing systems 38 at various locations may alternatively or additionally be provided, and the location of bearing systems 38 may be varied as appropriate to the application.
  • the low speed spool 30 generally includes an inner shaft 40 that interconnects a fan 42, a low pressure compressor 44 and a low pressure turbine 46.
  • the inner shaft 40 is connected to the fan 42 through a speed change mechanism, which in exemplary gas turbine engine 20 is illustrated as a geared architecture 48 to drive the fan 42 at a lower speed than the low speed spool 30.
  • the high speed spool 32 includes an outer shaft 50 that interconnects a high pressure compressor 52 and high pressure turbine 54.
  • a combustor 56 is arranged in exemplary gas turbine 20 between the high pressure compressor 52 and the high pressure turbine 54.
  • An engine static structure 36 is arranged generally between the high pressure turbine 54 and the low pressure turbine 46.
  • the engine static structure 36 further supports bearing systems 38 in the turbine section 28.
  • the inner shaft 40 and the outer shaft 50 are concentric and rotate via bearing systems 38 about the engine central longitudinal axis A which is collinear with their longitudinal axes.
  • each of the positions of the fan section 22, compressor section 24, combustor section 26, turbine section 28, and fan drive gear system 48 may be varied.
  • gear system 48 may be located aft of combustor section 26 or even aft of turbine section 28, and fan section 22 may be positioned forward or aft of the location of gear system 48.
  • the engine 20 in one non-limiting example is a high-bypass geared aircraft engine.
  • the engine 20 bypass ratio is greater than about six (6), with an example embodiment being greater than about ten (10)
  • the geared architecture 48 is an epicyclic gear train, such as a planetary gear system or other gear system, with a gear reduction ratio of greater than about 2.3
  • the low pressure turbine 46 has a pressure ratio that is greater than about five.
  • the engine 20 bypass ratio is greater than about ten (10:1)
  • the fan diameter is significantly larger than that of the low pressure compressor 44
  • the low pressure turbine 46 has a pressure ratio that is greater than about five 5:1.
  • Low pressure turbine 46 pressure ratio is pressure measured prior to inlet of low pressure turbine 46 as related to the pressure at the outlet of the low pressure turbine 46 prior to an exhaust nozzle.
  • the geared architecture 48 may be an epicycle gear train, such as a planetary gear system or other gear system, with a gear reduction ratio of greater than about 2.3:1. It should be understood, however, that the above parameters are only exemplary of one embodiment of a geared architecture engine and that the present disclosure is applicable to other gas turbine engines including direct drive turbofans.
  • the fan section 22 of the engine 20 is designed for a particular flight condition--typically cruise at about 0.8Mach and about 35,000 feet (10,668 meters).
  • TSFC' Thrust Specific Fuel Consumption
  • Low fan pressure ratio is the pressure ratio across the fan blade alone, without a Fan Exit Guide Vane (“FEGV”) system.
  • the low fan pressure ratio as disclosed herein according to one non-limiting embodiment is less than about 1.45.
  • Low corrected fan tip speed is the actual fan tip speed in ft/sec divided by an industry standard temperature correction of [(Tram °R)/(514.7 °R)] 0.5 .
  • the "Low corrected fan tip speed” as disclosed herein according to one non-limiting embodiment is less than about 1150 ft/second (350.5 m/sec).
  • gas turbine engine 20 is depicted as a turbofan, it should be understood that the concepts described herein are not limited to use with the described configuration, as the teachings may be applied to other types of engines such as, but not limited to, turbojets, turboshafts, and three-spool (plus fan) turbofans wherein an intermediate spool includes an intermediate pressure compressor (“IPC") between a low pressure compressor (“LPC”) and a high pressure compressor (“HPC”), and an intermediate pressure turbine (“IPT”) between the high pressure turbine (“HPT”) and the low pressure turbine (“LPT”).
  • IPC intermediate pressure compressor
  • LPC low pressure compressor
  • HPC high pressure compressor
  • IPT intermediate pressure turbine
  • a cooling design in a turbine section 28 for a gas turbine engine 20 may utilize a vane 106 disposed between axially adjacent bladed full hoop disks 108, 108a having respective blades 109, 109a.
  • vane 106 is disposed radially between an inner air seal 112 and a full hoop case 114 on an outer side.
  • Inner air seal 112 may be a full hoop structure supported by opposing vanes, including a plurality of vanes 106 that are separated in a circumferential direction.
  • Vane 106 is supported by the full hoop case 114 through segmented vane hooks 117, 117a.
  • One or more full hoop cover plates 115, 115a may minimize leakage between the vane 106 and the blades 109, 109a.
  • the vane 106 is radially supported by the full hoop case 114 with segmented case hooks 116, 116a in mechanical connection with the segmented vane hooks 117, 117a.
  • the vane 106 may be circumferentially supported between circumferentially adjacent platforms 119, 119a which may include feather seals that can minimize leakage between the adjacent vanes 106 into the gas path.
  • a turbine cooling air (TCA) conduit 125 provides cooling air into an outer diameter vane cavity 124 defined in part by an outer platform 119 and the full hoop case 114.
  • the vane 106 is hollow so that air can travel radially into and longitudinally downstream from the outer diameter vane cavity 124, through the vane 106 via one or more vane cavities 122, and into a vane inner diameter cavity 123.
  • the vane inner diameter cavity 123 is defined, in part, by an inner platform 119a. Thereafter air may travel through an orifice 120 in the inner air seal 112 and into a rotor cavity 121.
  • cooling air for at least portions of the vane 106 will flow from a platform region, into the vane, and then out of the vane and into another platform region and/or into a hot gaspath/main gaspath.
  • the platforms 119, 119a can include ejection holes to enable some or all of the air to be injected into the main gaspath.
  • vane 106 is illustrated in a radial direction, but other orientations for vane 106 are within the scope of the disclosure.
  • fluid such as cooling air can flow into the vane cavity 122 through an upstream opening illustrated herein as outer diameter cavity 124 and out through a downstream opening in vane cavity 122 illustrated herein as inner diameter cavity 123.
  • a longitudinal span of vane cavity 122 being between such openings.
  • the vane 106 includes one or more baffles 126 located within the vane 106.
  • the baffles 126 are positioned within one or more respective baffle cavities 128.
  • the baffle cavities 128 are sub-portions or sub-cavities of the vane cavity 122.
  • the baffle cavities 128 are internal cavities that are axially inward from the leading and trailing edges of the vane 106, although such arrangement is not to be limiting.
  • a radial direction R is upward on the page (e.g., radial with respect to an engine axis) and an axial direction A is to the right on the page (e.g., along an engine axis).
  • radial cooling flows will travel up or down on the page and axial flows will travel left-to-right (or vice versa).
  • a circumferential direction C is a direction into and out of the page about the engine axis.
  • Film cooling is used for airfoils. Cooling air can be directed into internal cavities of the airfoils and then purged or bled through film cooling holes on the exterior walls/surfaccs of the airfoils. The purged or bled air will form a film on the exterior surface of the airfoil and provide film cooling thereto.
  • introducing cooling flow back into the gaspath as film cooling incurs a cycle penalty, lowering TSFC, particularly in post-gage point locations on the convex side of an airfoil where mixing losses are particularly high. Accordingly, it may be desirable to cool such locations utilizing more effective localized internal backside convection rather than ejecting cooling air via film holes at airfoil locations which inherently increase aerodynamic losses adversely impacting turbine efficiency.
  • embodiments provided herein are directed to cooling schemes for airfoil cooling configurations that employ two opposing, converging mini-core or hybrid skin core cavities to convectively cool a post-gage convex portion of the airfoil.
  • hybrid when referring to a skin core cooling cavity passage of an airfoil or other gas turbine engine component is a cavity with a double-walled cooling channel having one wall exposed to a hot temperature fluid and the other wall not exposed to the hot temperature fluid. Further, the term can refer to single passages or multiple passages within an airfoil that have similar features.
  • a hybrid skin core cavity of the present disclosure may be an internal cavity with an external hot wall that is exposed to a hot gaspath and an internal cold wall that is not exposed to the hot gaspath.
  • the hybrid skin core cavities converge or taper in a radial direction. Such tapered hybrid skin core cavities can increase heat transfer as the cooling air heats up as it flows through the hybrid skin core cavities. Further, rather than bleeding air from the hybrid skin core cavities as a film on the airfoil, the hybrid cavities connect to a platform cooling passage.
  • the air within the platform hybrid skin core cooling passage will discharge cooling air flow through film cooling holes along the inner diameter and/or outer diameter platform gaspath surfaces and/or along mating surfaces with adjacent components.
  • such arrangement allows for the same cooling air to cool both a portion of the airfoil and the platform exterior surfaces concurrently, through at least two passages concurrently.
  • FIGS. 3A-3C schematic illustrations of an airfoil 300 in accordance with an embodiment of the present invention are shown.
  • the airfoil 300 includes an airfoil body 302 extending between a first platform 304 and a second platform 306.
  • the airfoil body 302 extends between a leading edge 308 and a trailing edge 310.
  • the airfoil 300 is arranged as a vane which can be installed within a gas turbine engine, as will be appreciated by those of skill in the art.
  • FIG. 3A is an isometric illustrative schematic of the airfoil 300, FIG.
  • FIG. 3B is a side view elevation cross-sectional illustration of the airfoil 300 as viewed along the line B-B shown in FIG. 3C
  • FIG. 3C is a cross-sectional illustration of the airfoil 300 as viewed along the line C-C shown in FIG. 3B .
  • the airfoil body 302 includes internal cooling cavities which are arranged to enable cooling of the airfoil 300.
  • the airfoil 300 includes a leading edge cavity 312, a trailing edge cavity 314, a first hybrid skin core cooling cavity passage 316, and a second hybrid skin core cooling cavity passage 318.
  • the first hybrid skin core cooling cavity passage 316 and the second hybrid skin core cooling cavity passage 318 are formed with a hot wall being a suction side 320 of the airfoil 300 and a cold wall being a wall of the trailing edge cavity 314.
  • the first hybrid skin core cooling cavity passage 316 has a first cavity width W 1 and the second hybrid skin core cooling cavity passage 318 has a second cavity width W 2 .
  • the hybrid skin core cooling cavity passages of the present disclosure may have low hydraulic diameters.
  • the hybrid skin core cooling cavity passage may have a width W (e.g., W 1 , W 2 shown in FIG. 3B ) that is a distance along the hot or cold wall of the hybrid skin core cooling cavity passage (e.g., axial or chord-wise direction relative to the airfoil) and a height H that is a distance or length between the hot wall and the cold wall of the hybrid skin core cooling cavity passage (e.g., circumferential direction with respect to the airfoil), where the aspect ratio of a cooling channel passage is defined as the ratio of the height H to the width W ( H / W ).
  • the hybrid skin core cooling cavity passages may have a varying height and width along a length thereof.
  • the height H and/or width W can be varied along the length (e.g., H first end ⁇ H second end and/or W first end ⁇ W second end in the radial span-wise and chord-wise directions).
  • some of the hybrid skin core cooling cavity passages of airfoils of the present disclosure may be uniform in dimension, and thus the present illustrations and description are merely for illustrative and explanatory purposes, and no limitation is intended.
  • Each of the first and second hybrid skin core cooling cavity passages 316, 318 are fluidly connected such that an airflow can pass between the first and second platforms 304, 306.
  • the first hybrid skin core cooling cavity passage 316 has a first cavity inlet 322 formed in the first platform 304 and a first cavity outlet 324 formed in the second platform 306.
  • cooling flow through the first hybrid skin core cooling cavity passage 316 will flow from the first platform 304 toward the second platform 306, from the respective first cavity inlet 322 to the first cavity outlet 324.
  • the second hybrid skin core cooling cavity passage 318 has a counter-flow direction as compared to the flow through the first hybrid skin core cooling cavity passage 316, with a second cavity inlet 326 formed in the second platform 306 and a second cavity outlet 328 formed in the first platform 304.
  • the first and second hybrid skin core cooling cavity passages 316, 318 are fed with cooling air from the respective platforms 304, 306 in which the inlets 322, 326 are formed.
  • a first platform feed cavity 330 is formed within or by the first platform 304 and fluidly connected to the first hybrid skin core cooling cavity passage 316 at the first cavity inlet 322.
  • the first hybrid skin core cooling cavity passage 316 is fluidly connected to a second platform exit cavity 332, which is defined by the second platform 306 and, optionally, a coverplate, as will be appreciated by those of skill in the art.
  • Cooling air within the second platform exit cavity 332 can be ejected through a surface of the second platform 306 and into a main gaspath of the gas turbine engine.
  • the second platform 306 includes one or more purge apertures 336 formed in the surface of the second platform 306 that fluidly connects the second platform exit cavity 332 with the main gaspath 338 of the gas turbine engine.
  • the purge apertures 336 may be arranged to eject the air into or onto mating surfaces with circumferentially adjacent vane/platforms and/or at interstage gaps with a blade outer air seal.
  • the purge apertures may be film cooling holes that are formed having various geometric shapes, including, but not limited to one or more of cylindrical, conical, slot, diffused, shaped, single, and/or multi-lobe geometries.
  • the geometry and/or shape may be selected based on the specific location of a particular purge aperture (e.g., gaspath or interstage gap, etc.).
  • a second platform feed cavity 340 is formed within or by the second platform 306 and fluidly connected to the second hybrid skin core cooling cavity passage 318 at the second cavity inlet 326.
  • the second hybrid skin core cooling cavity passage 318 is fluidly connected to a first platform exit cavity 342. Cooling air within the first platform exit cavity 342 can be ejected through a surface of the first platform 306 and into the main gaspath 338 of the gas turbine engine.
  • One or more purge apertures 344 formed in the first platform 304 provide a fluid connection between the first platform exit cavity 342 and the main gaspath 338.
  • the platform exit cavities 332, 342 are arranged to provide a pressure differential to pull the cooling air from the respective platform feed cavities 330, 340.
  • the purge apertures 336, 344 can be arranged to form a film along a surface of the respective platforms 304, 306 within the main gaspath 338. Further, in some embodiments, some or all of the purge apertures can be arranged to purge the air to locations of the platforms 304, 306 not exposed to the main gaspath 338.
  • each of the first and second hybrid skin core cooling cavity passages 316, 318 tapers or narrows from the respective inlet 322, 326 to the respective outlet 324, 328. That is, as the first hybrid skin core cooling cavity passage transitions from the first cavity inlet 322 to the first cavity outlet 324, the first cavity width W 1 decreases in dimension. Similarly, as the second hybrid skin core cooling cavity passage transitions from the second cavity inlet 326 to the second cavity outlet 328, the second cavity width W 2 decreases in dimension.
  • the tapering features of the hybrid skin core cooling cavity passages can be provided to control and/or ensure sufficient convective cooling to be applied to the hot wall of the respective hybrid skin core cooling cavity passages.
  • hybrid skin core cooling cavity passages may connect through the pressure side of the airfoil in a similar manner.
  • one or more of the hybrid skin core cooling cavity passages may include thermal transfer augmentation features.
  • the first hybrid skin core cooling cavity passage 316 includes a plurality of thermal transfer augmentation features 346.
  • Thermal heat transfer augmentation features in accordance with the present disclosure may comprise of various geometric shapes and types.
  • internal heat transfer augmentation features may include, but are not limited to, trip strips, turbulators, pin fins, pedestals, dimples, etc. that may be used independently and/or in conjunction with one another in order to provide the desired and optimal heat transfer, pressure loss, and cooling air temperature heat pickup required to achieve local metal temperature and durability oxidation, creep, and thermal mechanical fatigue requirements.
  • embodiments provided herein are directed to cooling schemes for airfoils of gas turbine engines that enable passive cooling to hot walls of the airfoils without using film cooling. Further, advantageously, embodiments provided herein can enable improved TSFC by reducing required film flow. Moreover, advantageously, embodiments provided herein enable dual-cooling capability through simultaneously cooling portions of an airfoil body and also platform circuits. Furthermore, advantageously, embodiments provided herein provide effective and efficient utilization of cooling air.
  • the term "about” is intended to include the degree of error associated with measurement of the particular quantity based upon the equipment available at the time of filing the application. For example, “about” may include a range of ⁇ 8%, or 5%, or 2% of a given value or other percentage change as will be appreciated by those of skill in the art for the particular measurement and/or dimensions referred to herein.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (7)

  1. Schaufelprofil (300) für ein Gasturbinentriebwerk (20), wobei das Schaufelprofil Folgendes umfasst:
    einen Schaufelprofilkörper (302), der sich zwischen einer ersten Plattform (304) und einer zweiten Plattform (306) erstreckt;
    einen Zufuhrhohlraum (330) der ersten Plattform, der durch die erste Plattform definiert ist;
    einen Ausgangshohlraum (332) der zweiten Plattform, der durch die zweite Plattform definiert ist;
    einen Zufuhrhohlraum (340) der zweiten Plattform, der durch die zweite Plattform (306) definiert ist;
    einen Ausgangshohlraum (342) der ersten Plattform, der durch die erste Plattform definiert ist;
    mindestens eine Öffnung (336), die in der zweiten Plattform gebildet ist und den Ausgangshohlraum der zweiten Plattform mit einer Außenseite der zweiten Plattform fluidverbindet, mindestens eine Öffnung (344), die in der ersten Plattform gebildet ist und den Ausgangshohlraum der ersten Plattform mit einer Außenseite der ersten Plattform fluidverbindet, einen Vorderkantenhohlraum (312), und
    einen Hinterkantenhohlraum (314), der entlang einer Druckseite des Schaufelprofilkörpers zu einer Hinterkante des Schaufelprofilkörpers angeordnet ist,
    wobei ein erster Hybridhautkernkühlhohlraumdurchlass (316) innerhalb des Schaufelprofilkörpers gebildet ist und den Zufuhrhohlraum der ersten Plattform mit dem Ausgangshohlraum der zweiten Plattform fluidverbindet; wobei der erste Hybridhautkernkühlhohlraumdurchlass (316) eine variable erste Hohlraumbreite (W1) aufweist, die entlang einer Strömungsrichtung von dem Zufuhrhohlraum der ersten Plattform zu dem Ausgangshohlraum der zweiten Plattform zusammenfließt, wobei sich der erste Hybridhautkernkühlhohlraumdurchlass (316) innerhalb des Schaufelprofilkörpers (302) entlang einer Ansaugseite (320) des Schaufelprofilkörpers befindet; wobei der Schaufelprofilkörper keine Öffnungen beinhaltet, die den ersten Hybridhautkernkühlhohlraumdurchlass mit einer Außenseite des Schaufelprofilkörpers fluidverbinden;
    wobei ein zweiter Hybridhautkernkühlhohlraumdurchlass (318) innerhalb des Schaufelprofilkörpers gebildet ist und den Zufuhrhohlraum der zweiten Plattform mit dem Ausgangshohlraum der ersten Plattform fluidverbindet, wobei der zweite Hybridhautkernkühlhohlraum benachbart zu dem ersten Hybridhautkernkühlhohlraum entlang der Ansaugseite des Schaufelprofilkörpers angeordnet ist; und
    wobei der Schaufelprofilkörper (302) keine Öffnungen beinhaltet, die den zweiten Hybridkernkühlhohlraumdurchlass mit einer Außenseite des Schaufelprofilkörpers fluidverbinden;
    dadurch gekennzeichnet, dass:
    die mindestens eine Öffnung, die in der zweiten Plattform gebildet ist, eine Spülöffnung (336) ist;
    die mindestens eine Öffnung, die in der ersten Plattform gebildet ist, eine Spülöffnung (344) ist;
    der erste Hybridhautkernkühlhohlraumdurchlass (316) zwischen einer heißen Außenfläche des Schaufelprofilkörpers entlang der Ansaugseite (320) des Schaufelprofils (300) und einer kalten Innenwand definiert ist, die eine Wand des Hinterkantenhohlraums (314) definiert; und
    wobei der zweite Hybridhautkernkühlhohlraumdurchlass (318) zwischen einer heißen Außenfläche des Schaufelprofilkörpers entlang der Ansaugseite (320) des Schaufelprofils (300) und einer kalten Innenwand definiert ist, die eine Wand des Hinterkantenhohlraums (314) definiert.
  2. Schaufelprofil nach Anspruch 1, das ferner mindestens ein Wärmeübertragungsverstärkungsmerkmal (346) innerhalb des ersten Hybridhautkernkühlhohlraumdurchlasses (316) umfasst.
  3. Schaufelprofil nach Anspruch 1 oder 2, wobei die erste Hohlraumbreite (W1) größer an dem Zufuhrhohlraum (330) der ersten Plattform und kleiner an dem Ausgangshohlraum (332) der zweiten Plattform ist, sodass sich der erste Hybridhautkernkühlhohlraumdurchlass (316) in einer Richtung von dem Zufuhrhohlraum der ersten Plattform zu dem Ausgangshohlraum der zweiten Plattform verjüngt.
  4. Schaufelprofil nach einem der vorhergehenden Ansprüche, wobei der Zufuhrhohlraum (330) der ersten Plattform teilweise durch eine Abdeckplatte (115) definiert ist, die an der ersten Plattform (304) angebracht ist.
  5. Schaufelprofil nach einem der vorhergehenden Ansprüche, wobei der Ausgangshohlraum (332) der zweiten Plattform teilweise durch eine Abdeckplatte (115) definiert ist, die an der zweiten Plattform (306) angebracht ist.
  6. Gasturbinentriebwerk, das Folgendes umfasst:
    ein Schaufelprofil nach einem der vorhergehenden Ansprüche.
  7. Gasturbinentriebwerk nach Anspruch 6,
    wobei das Schaufelprofil (300) innerhalb eines Hauptgaspfads (338) des Gasturbinentriebwerks (20) angebracht ist, und
    wobei die mindestens eine Spülöffnung (336), die in der zweiten Plattform (306) gebildet ist, dazu angeordnet ist, Luft aus dem Inneren des Ausgangshohlraums (332) der zweiten Plattform in den Hauptgaspfad zu spülen.
EP19152897.5A 2018-01-19 2019-01-21 Gekühltes schaufelblatt und zugehöriges gasturbinentriebwerk Active EP3514331B1 (de)

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US11982206B2 (en) * 2022-03-11 2024-05-14 Mitsubishi Heavy Industries, Ltd. Cooling method and structure of vane of gas turbine

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